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Summary
I am the inventor of a Word-Sudoku version called SWUDOKU. The name SWUDOKU is a registered tradename in my name. With SWUDOKU one can use the entire alphabeth, symbols and pictures. The "trick is number-equivalence" as used with cellphones and text messaging. My book "Creative Sudoku" ISBN 1-59800-730-0 explains it in detail or visit www.swudoku.com